Sample characteristics
Table 1 reports descriptive statistics for the HRV index, the subdimensions of the RRS, the three depression questionnaires, and Depressionstandardized. After removing the samples that had physiological data with poor quality or with values higher than three standard deviations above the mean, a total of 1189 participants were finally included. The sample sizes vary somewhat per variable due to the different types of questionnaires collected in different experiments.